OFDMA


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OFDMA

(Orthogonal Frequency Division Multiple Access) A cellular air interface based on OFDM for multiple, simultaneous users. The multiuser capability is achieved by assigning each user a subset of OFDM subcarriers (see OFDM). Used in communications networks such as WiMAX and LTE, OFDMA provides air interfaces that are superior to CDMA and TDMA. See SC-FDMA, WiMAX, LTE, CDMA and TDMA.
References in periodicals archive ?
To overcome synchronization problem in OFDMA system, NI PXI 6683 timing and synchronization module is employed for 10 MHz clock signal.
The performance is evaluated using Matlab based system level simulator that is enhanced with the HGBBDSA algorithm to allocate the OFDMA subcarriers.
Lee, "Swap-based frequency-domain packet scheduling algorithm for small-queue condition in OFDMA," IEEE Communications Letters, vol.
In this section, OFDMA, NOMA, Sparse code multiple access (SCMA) and IDMA are investigated to highlight their fortes and weaknesses as candidates for FRA.
In the OFDMA cellular network, the performance of the edge region stays reduced due to the inter-cell interference.
Simulations were also performed for a system with OFDMA uplink victim and OFDMA uplink interferer.
OFDMA systems have much higher frequency efficiency, but due to their structural characteristics, co-sub-channel interferences inevitably occur.
WiMax uses OFDMA that has ability to split data into multiple logical data streams for achieving the higher data rate[2].
Alternatively, an OFDM-based multiple access mechanism, namely the OFDMA, assigns sets of subcarriers to different users.
In [9], a heuristic scheduler design maximizes the system throughput while providing fairness between users in an OFDMA system was proposed.
But given the lack of self developed momentum as a standard, WiBro has joined WiMAX and agreed to harmonize with the similar OFDMA 902.
A realistic 20MSPS 256point complex FFT would take less than 5% of the PC102's capability; while a 2048point transform for OFDMA mode would require just 8%.